论文部分内容阅读
研究了真实烟气环境下国产Super304H耐热钢试验管的高温腐蚀性能。通过X射线衍射仪、扫描电镜和能谱分析仪对该试验管进行研究。结果表明:断面腐蚀层呈多层结构,包括外层、内层和渗透层。其中腐蚀外层发生碱金属复合硫酸盐反应,内层发生氧化反应,而渗透层中氧化和硫化反应同时进行。试验管外表面发生剥落,剥落位置位于腐蚀内外层间的界面,主要原因为运行过程温度的波动性及内外腐蚀层的热膨胀差异性。
The high temperature corrosion performance of domestic Super304H heat-resistant steel test tube under real flue gas environment was studied. The test tube was investigated by X-ray diffraction, scanning electron microscopy and energy spectrum analyzer. The results show that the cross-section corrosion layer has a multi-layer structure, including the outer layer, the inner layer and the infiltration layer. Among them, alkali metal sulfate complex reaction occurs in the outer layer of the corrosion, the oxidation reaction occurs in the inner layer, and the oxidation and sulfurization reactions in the permeation layer proceed simultaneously. The outer surface of the test tube is peeled off, and the peeling position is located at the interface between the inner and outer layers of the corrosion. The main reason is the temperature fluctuation during operation and the difference in thermal expansion between the inner and outer corrosion layers.